HSM Game King 30-06 Springfield 180 Gr Spitzer Boat Tail SBT 20 Bx/. Now HSM has developed an entire lineup of fine hunting ammunition featuring the time-honored Sierra GameKing/Pro-Hunter bullets. Each caliber's individual components have been precisely matched to each GameKing/Pro-Hunter bullet to maximize their potential for accuracy and performance. Specifications for HSM 300641N Game King 30-06 Springfield 180 Gr Spitzer Boat Tail (SBT) 20 Bx/ 2: Manufacturer: HSM Ammunition Caliber: .30-06 Springfield Number of Rounds: 20 Bullet Type: Spitzer Boat Tail (SBT) Bullet Weight: 180 grain Cartridge Case Material: Brass Application: Hunting Primer Style: Centerfire What is HSM 300641N Game King 30-06 Springfield 180 Gr Spitzer Boat Tail (SBT) 20 Bx/ 2 good for? The manufacturer says that it is good for hunting.